Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369113
Danilo R. B. Araújo, C. Bastos-Filho, J. Martins-Filho
Recent studies demonstrated the feasibility of surrogate methods to assess optical networks based on Artificial Neural Networks (ANNs). However, surrogate methods present different trade offs between accuracy and resource utilization efficiency, such as computational time. In this paper we analyze the use of ANN to forecast the Blocking Probability (BP) of deployed optical networks considering different architectures for the underlying alternative method. We also analyze the impact of the adopted physical layer model and the number of optical networks needed to train the ANN. We compare the results of our proposal with the outcome of a discrete event network simulator. From our results we can conclude that ANN is a promising technique to estimate the BP of transparent optical networks, but the dataset used to train the ANN and the physical layer model are crucial for the proper design of this type of tool.
{"title":"Analyzing surrogate models to assess Blocking Probability of optical networks","authors":"Danilo R. B. Araújo, C. Bastos-Filho, J. Martins-Filho","doi":"10.1109/IMOC.2015.7369113","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369113","url":null,"abstract":"Recent studies demonstrated the feasibility of surrogate methods to assess optical networks based on Artificial Neural Networks (ANNs). However, surrogate methods present different trade offs between accuracy and resource utilization efficiency, such as computational time. In this paper we analyze the use of ANN to forecast the Blocking Probability (BP) of deployed optical networks considering different architectures for the underlying alternative method. We also analyze the impact of the adopted physical layer model and the number of optical networks needed to train the ANN. We compare the results of our proposal with the outcome of a discrete event network simulator. From our results we can conclude that ANN is a promising technique to estimate the BP of transparent optical networks, but the dataset used to train the ANN and the physical layer model are crucial for the proper design of this type of tool.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125409815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369047
E. Silveira, D. Nascimento, J. C. da S. Lacava
This paper reports the design of probe-fed moderately thick microstrip antenna for dual orthogonal circularly-polarized radiation. The antenna is composed of a rectangular truncated patch and the polarization diversity is achieved by controlling the states of four PIN diodes. The rectangular patch is designed according to the null reactance condition. Simulated radiation pattern, reflection coefficient magnitude and axial ratio are in good agreement with experimental results.
{"title":"Reconfigurable truncated corners microstrip antenna","authors":"E. Silveira, D. Nascimento, J. C. da S. Lacava","doi":"10.1109/IMOC.2015.7369047","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369047","url":null,"abstract":"This paper reports the design of probe-fed moderately thick microstrip antenna for dual orthogonal circularly-polarized radiation. The antenna is composed of a rectangular truncated patch and the polarization diversity is achieved by controlling the states of four PIN diodes. The rectangular patch is designed according to the null reactance condition. Simulated radiation pattern, reflection coefficient magnitude and axial ratio are in good agreement with experimental results.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124982146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369187
R. Oliveira, J. Souza, F. Magno, K. Cozzolino, G. Cavalcante
In this paper the formalism of Parabolic Equations for narrow angles, a statistical method, the Moving Average and a empirical model, the Hata-Davidson, were used for to study on the quality of digital TV signal in the UHF band, and were compared with the measured in an heterogeneous environment, because it has areas with large buildings mixed with Amazonian vegetation. The implicit finite difference scheme of the Crank-Nicolson type was applied in order to get the solution of the Parabolic Equation. The propagation was considered in 15° in the direction paraxial. The results showed that the formalism of Parabolic Equations can be used to study the quality of digital TV signal. The average error was 1.62 dB and standard deviation 4.13 dB.
{"title":"Application of Parabolic Equation and Hata-Davidson propagation models for digital TV coverage prediction","authors":"R. Oliveira, J. Souza, F. Magno, K. Cozzolino, G. Cavalcante","doi":"10.1109/IMOC.2015.7369187","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369187","url":null,"abstract":"In this paper the formalism of Parabolic Equations for narrow angles, a statistical method, the Moving Average and a empirical model, the Hata-Davidson, were used for to study on the quality of digital TV signal in the UHF band, and were compared with the measured in an heterogeneous environment, because it has areas with large buildings mixed with Amazonian vegetation. The implicit finite difference scheme of the Crank-Nicolson type was applied in order to get the solution of the Parabolic Equation. The propagation was considered in 15° in the direction paraxial. The results showed that the formalism of Parabolic Equations can be used to study the quality of digital TV signal. The average error was 1.62 dB and standard deviation 4.13 dB.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130161008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369077
R. V. Favero, J. S. Marçal, Paulo C. B. Silva, L. H. Bonani, M. Abbade
In this paper, we propose and analyze a new defragmentation strategy for elastic optical networks (EON). Such strategy is based on the cyclical identification of the most fragmented optical link followed by later reallocation of the lighpaths that share it. Our computer simulation results indicate that the considered scheme offers a blocking probability reduction of up to 48% in comparison to the situation where no defragmentation is deployed.
{"title":"A new elastic optical network defragmentation strategy based on the reallocation of lightpaths sharing the most fragmented link","authors":"R. V. Favero, J. S. Marçal, Paulo C. B. Silva, L. H. Bonani, M. Abbade","doi":"10.1109/IMOC.2015.7369077","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369077","url":null,"abstract":"In this paper, we propose and analyze a new defragmentation strategy for elastic optical networks (EON). Such strategy is based on the cyclical identification of the most fragmented optical link followed by later reallocation of the lighpaths that share it. Our computer simulation results indicate that the considered scheme offers a blocking probability reduction of up to 48% in comparison to the situation where no defragmentation is deployed.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124393770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369158
Paulo Fernandes da Silva, P. H. da Fonseca Silva, J. Costa e Silva, Alexandre Ferreira dos Santos, Maria do Carmo de Luna M Frazao, A. Serres, R. C. Silverio Freire
The study of printed monopole antennas (PMA) with truncated ground plane has application in various types of technologies. This kind of ground plane, promotes an omnidirectional radiation pattern with broadband response and allows the antenna to suffer influence from nearby conductive material. This article presents the simulated and measured results of influences from a rectangular aluminum tube on a circular PMA that meets the UWB technology requirements. The results obtained indicate that the tube at a wavelength distance of 1/8? reduce the bandwidth by 50% in X-band (8 ~ 12 GHz), half power bandwidth HPBW is approximately 90° and gain of 6.92 dBi.
{"title":"Influence of conductor tube in circular PMA for UWB range","authors":"Paulo Fernandes da Silva, P. H. da Fonseca Silva, J. Costa e Silva, Alexandre Ferreira dos Santos, Maria do Carmo de Luna M Frazao, A. Serres, R. C. Silverio Freire","doi":"10.1109/IMOC.2015.7369158","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369158","url":null,"abstract":"The study of printed monopole antennas (PMA) with truncated ground plane has application in various types of technologies. This kind of ground plane, promotes an omnidirectional radiation pattern with broadband response and allows the antenna to suffer influence from nearby conductive material. This article presents the simulated and measured results of influences from a rectangular aluminum tube on a circular PMA that meets the UWB technology requirements. The results obtained indicate that the tube at a wavelength distance of 1/8? reduce the bandwidth by 50% in X-band (8 ~ 12 GHz), half power bandwidth HPBW is approximately 90° and gain of 6.92 dBi.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127960123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369062
V. Dmitriev, G. Portela, Leno Martins
Three-port circulators based on magneto-optical resonators in 2D photonic crystals with low symmetry are investigated. We consider different geometries of the circulators in photonic crystals with triangular and square unit cells. All of the three-ports possess only one specific element of symmetry named antiplane of symmetry. The theoretical part of our paper concerns scattering matrix analysis for different regimes of circulation. In particular, we define the scattering matrices of ideal circulator and a special type of conditions which allow one to transform the nonreciprocal three-port in ideal circulator. One case of non-ideal circulators is considered as well. Finally, one example of the circulator simulations with calculated frequency responses in photonic crystals based on triangular unit cells is presented.
{"title":"Magneto-optical photonic crystal-based three-port circulators with low symmetry","authors":"V. Dmitriev, G. Portela, Leno Martins","doi":"10.1109/IMOC.2015.7369062","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369062","url":null,"abstract":"Three-port circulators based on magneto-optical resonators in 2D photonic crystals with low symmetry are investigated. We consider different geometries of the circulators in photonic crystals with triangular and square unit cells. All of the three-ports possess only one specific element of symmetry named antiplane of symmetry. The theoretical part of our paper concerns scattering matrix analysis for different regimes of circulation. In particular, we define the scattering matrices of ideal circulator and a special type of conditions which allow one to transform the nonreciprocal three-port in ideal circulator. One case of non-ideal circulators is considered as well. Finally, one example of the circulator simulations with calculated frequency responses in photonic crystals based on triangular unit cells is presented.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133835711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369073
T. V. B. Faria, F. Moreira
The present paper aims to extended a formalism to synthesize the main reflector of an omnidirectional axis-displaced Cassegrain (OADC) through two case studies. The numerical synthesis is based on the consecutive concatenation of elliptical sections. Furthermore, a power distribution pattern it specified on the reflector cylindrical aperture to produce, according to Geometrical Optics, a sectoral coverage. The shaping results are validated using method-of-moments (MoM) analysis.
{"title":"Main reflector synthesis of omnidirectional reflector antennas using elliptical sections","authors":"T. V. B. Faria, F. Moreira","doi":"10.1109/IMOC.2015.7369073","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369073","url":null,"abstract":"The present paper aims to extended a formalism to synthesize the main reflector of an omnidirectional axis-displaced Cassegrain (OADC) through two case studies. The numerical synthesis is based on the consecutive concatenation of elliptical sections. Furthermore, a power distribution pattern it specified on the reflector cylindrical aperture to produce, according to Geometrical Optics, a sectoral coverage. The shaping results are validated using method-of-moments (MoM) analysis.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116565192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369069
R. Figueiredo, T. Sutili, N. Ribeiro, E. Conforti, C. Gallep
Experimental sweep frequency results of electro-optical conversion for a chip-on-carrier and for a packaged semiconductor optical amplifiers are presented up to the fifth harmonic. Influence from electrical bias current, spectral components, and input power are analyzed. The experimental results illustrate the influence of electrical parasitic elements in semiconductor optical amplifiers' bandwidth and could be used for equivalent circuit parameters extraction.
{"title":"Electro-optical conversion analysis of chip-on-carrier and packaged semiconductor optical amplifiers","authors":"R. Figueiredo, T. Sutili, N. Ribeiro, E. Conforti, C. Gallep","doi":"10.1109/IMOC.2015.7369069","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369069","url":null,"abstract":"Experimental sweep frequency results of electro-optical conversion for a chip-on-carrier and for a packaged semiconductor optical amplifiers are presented up to the fifth harmonic. Influence from electrical bias current, spectral components, and input power are analyzed. The experimental results illustrate the influence of electrical parasitic elements in semiconductor optical amplifiers' bandwidth and could be used for equivalent circuit parameters extraction.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128058428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369223
Samuel M. L. da Silva, M. C. Rezende, Alberto J. Orlando Faro, Newton A S Gomes
A cylinder with 2.5m of length and 0.15 m of diameter had its RCS (radar cross section) measurement performed. Subsequently, its RCS was reduced with microwave absorbing material. It was studied what the impact to the RCS of the target after transform the cylinder coated with material into a cylindrical cavity. The absorber material behavior was evaluated under the strain of a cylindrical curvature compared to the initial characterization data held in flat surface. Thus, was obtained about 20 dBsm (side) and 6 dBsm (bases) for the RCS of the cylinder. The material with 18 dB absorption capacity presented 14 dB in the case of cylindrical target, a result considered satisfactory, since this value was limited by the baseline scattering present in the “setup”. It was observed that, even subject to the stresses of curvature, the material showed no plastic deformation or cracking. Finally, it was found that the reduced RCS (360°) of the cylindrical cavity was increased in relation to the reduced RCS of the cylinder.
{"title":"Effects of cavity on RCS of cylinder coated with microwaves absorbing material","authors":"Samuel M. L. da Silva, M. C. Rezende, Alberto J. Orlando Faro, Newton A S Gomes","doi":"10.1109/IMOC.2015.7369223","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369223","url":null,"abstract":"A cylinder with 2.5m of length and 0.15 m of diameter had its RCS (radar cross section) measurement performed. Subsequently, its RCS was reduced with microwave absorbing material. It was studied what the impact to the RCS of the target after transform the cylinder coated with material into a cylindrical cavity. The absorber material behavior was evaluated under the strain of a cylindrical curvature compared to the initial characterization data held in flat surface. Thus, was obtained about 20 dBsm (side) and 6 dBsm (bases) for the RCS of the cylinder. The material with 18 dB absorption capacity presented 14 dB in the case of cylindrical target, a result considered satisfactory, since this value was limited by the baseline scattering present in the “setup”. It was observed that, even subject to the stresses of curvature, the material showed no plastic deformation or cracking. Finally, it was found that the reduced RCS (360°) of the cylindrical cavity was increased in relation to the reduced RCS of the cylinder.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128160936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369151
J. Leufker, D. Fritsche, G. Tretter, M. Khafaji, C. Carta, F. Ellinger
This paper describes the design, modelling and characterization of transmission lines for millimetre wave silicon integrated circuits up to 65 GHz. The simulation results of three different EM simulators for a selected hybrid coplanar layout structure are presented. Two different deembedding methods are investigated and compared with respect to sensitivity to typical measurement errors. Finally both methods are applied to the measurement results of the fabricated test structures in a 250 nm BiCMOS technology showing good agreement to EM simulations and predicted sensitivity to measurement errors.
{"title":"Design, modelling and characterization of transmission lines for mm-wave silicon ICs","authors":"J. Leufker, D. Fritsche, G. Tretter, M. Khafaji, C. Carta, F. Ellinger","doi":"10.1109/IMOC.2015.7369151","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369151","url":null,"abstract":"This paper describes the design, modelling and characterization of transmission lines for millimetre wave silicon integrated circuits up to 65 GHz. The simulation results of three different EM simulators for a selected hybrid coplanar layout structure are presented. Two different deembedding methods are investigated and compared with respect to sensitivity to typical measurement errors. Finally both methods are applied to the measurement results of the fabricated test structures in a 250 nm BiCMOS technology showing good agreement to EM simulations and predicted sensitivity to measurement errors.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131751842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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